Watt per kilo (W/kg) is a cycling metric that measures how much power you produce in watts relative to your body weight in kilograms.
It shows how efficiently you can turn your strength into speed, especially on climbs.
The higher your W/kg, the better you can perform when the road goes uphill.
To calculate it, divide your power output (in watts) by your weight in kilograms.
For example, if you ride at 250 watts and weigh 70 kg, your W/kg is 3.57.
This metric helps compare cyclists of different sizes on equal terms.
A lighter rider with a high W/kg will usually climb faster than a heavier rider with the same absolute power.
W/kg is often used to define racing categories and training benchmarks.
Improving your W/kg can be done by increasing your power through training, reducing your weight, or both.